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Fingerprint image preprocessing method and device

A preprocessing device, fingerprint image technology, applied in instruments, character and pattern recognition, computer parts and other directions, can solve the problem of difficult to accurately identify image texture information, achieve high fidelity, ensure recognition accuracy and recognition efficiency, High image quality effect

Inactive Publication Date: 2015-02-25
智慧眼科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fingerprint image preprocessing method and device to solve the technical problem that in the existing fingerprint recognition process, the texture information of the image is difficult to be accurately recognized due to the noise interference of the fingerprint image

Method used

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  • Fingerprint image preprocessing method and device
  • Fingerprint image preprocessing method and device
  • Fingerprint image preprocessing method and device

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Embodiment 1

[0060] A preferred embodiment of the present invention provides a fingerprint image preprocessing method, referring to figure 1 , the method includes:

[0061] Step S101, performing smoothing processing on the received fingerprint image to obtain a smoothed first image;

[0062] figure 2 A schematic diagram of the original fingerprint image in this embodiment is given, and the received original fingerprint image and the smoothing filter kernel s x Carry out convolution operation, to obtain the smoothed first image (such as image 3 As shown), the convolution operation can remove the noise of the original fingerprint image, and can better preserve the texture properties and spatial resolution of the image. In this embodiment, optionally, the smoothing filter kernel s x The values ​​are as follows:

[0063] s x = 1 16 * 1 ...

Embodiment 2

[0092] For the above method embodiments, the present invention also provides corresponding device embodiments. refer to Figure 8 , the present embodiment fingerprint image preprocessing device comprises:

[0093] A smoothing processing module 101, configured to perform smoothing processing on the received fingerprint image to obtain a smoothed first image;

[0094] The first image enhancement processing module 102 is configured to perform a first enhancement process on the first image. The first enhancement process includes: performing a convolution operation on an image block of a predetermined size on the first image with an enhancement kernel of a corresponding size, so as to obtain the second image after local enhancement processing;

[0095] The first normalization processing module 103 is configured to perform normalization processing on the second image to obtain a third image;

[0096] An arithmetic module 104, configured to calculate the ridge direction angle and ...

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Abstract

The invention discloses a fingerprint image preprocessing method and device. The method includes the steps that a received fingerprint image is smoothed so that a first image can be obtained; the first image is processed through first enhancement so that a second image which is locally enhanced can be obtained; the second image is normalized so that a third image can be obtained; the fingerprint line direction angle and the fingerprint line frequency of the third image are calculated; the third image is processed through second enhancement so that a fourth image which is locally enhanced can be obtained; the fourth image is normalized so that a preprocessed output image can be obtained. According to the method and device, because the received fingerprint image is enhanced twice, the image quality of the fingerprint image enhanced twice can be high, the fidelity factor of the fingerprint line direction and the fingerprint line frequency of the preprocessed fingerprint image is high, and the identification accuracy and the identification efficiency of subsequent fingerprint recognition applications can be conveniently guaranteed.

Description

technical field [0001] The present invention relates to the technical field of fingerprint image processing, in particular to a fingerprint image preprocessing method and device. Background technique [0002] With the rapid development of the Internet, biometric technology is widely used, especially fingerprint recognition. Automatic fingerprint identification technology refers to a biometric identification technology that uses the distribution pattern of ridges and valleys on the surface of fingers to identify the identity of an object. As one of the basic characteristics of the human body, fingerprints are unique, non-deformable, and arranged in regular distribution. Due to its unique characteristics, it has been widely promoted and applied in the field of biometric identification. Mobile phone manufacturers represented by Apple have integrated fingerprint recognition into mobile phones, and Huawei and Samsung have also successively launched mobile phones with fingerprint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/54
CPCG06V10/20
Inventor 周孺丁建华
Owner 智慧眼科技股份有限公司
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